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tribosphenic
tribosphenic adj. 
/ˌtrɪbə(ʊ)ˈsfiːnɪk/, /ˌtrɪbəˈsfinɪk/ Palaeontology (see quots. 1936, 19752). [ < tribo- comb. form + Greek σϕήν wedge (see sphene n.) + -ic suffix.]
Brit. /ˌtrʌɪbə(ʊ)ˈsfiːnɪk/
, /ˌtrʌɪbə(ʊ)ˈsfiːnɪk//ˌtrɪbə(ʊ)ˈsfiːnɪk/U.S. /ˌtraɪbəˈsfinɪk/
, /ˌtraɪbəˈsfinɪk//ˌtrɪbəˈsfinɪk/ΘΚΠ
the world > animals > animal body > general parts > head and neck > [adjective] > having teeth > tribosphenic arrangement of teeth
tribosphenic1936
1936 G. G. Simpson in Dental Cosmos LXXVIII. 797/1 At this stage the upper molar is implanted by two external and one internal root, the latter generally largest, and the lower molars are implanted by two sub-equal roots, one beneath the trigonid and one beneath the talonid... In order to have a single word..by which this type of molar dentition can be unequivocably..designated, I propose to call it ‘tribosphenic’.
1975 Nature 31 July 402/1 Therian mammals with tribosphenic molars were probably in existence at the beginning of the Cretaceous.
1975 Nature 31 July 402/1 Tribosphenic molars have an additional cusp on the upper molars (protocone) which fits into a basin (talonid) on the matching lower molar.
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